Mark ErrorPageTest.DNSError_GoBack2Forward2 as flaky on linux x64.
Mark ErrorPageTest.DNSError_GoBack2Forward2 as flaky on linux x64.

BUG=79412
TEST=none
Review URL: http://codereview.chromium.org/6852012

git-svn-id: http://src.chromium.org/svn/trunk/src@81514 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: a48b90d0005d3ee7cd0a1202a84792c2a6e47438
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser